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50V MOSFET Drivers For Battery-powered BLDC Motors

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50V MOSFET Drivers For Battery-powered BLDC Motors

Diodes Incorporated has announced new high-frequency gate-driver chips for driving two external N-channel MOSFETs in a half-bridge configuration. A 50V rating suits a wide range of motor driving requirements, especially brushless DC (BLDC) motors, which are increasingly being used in battery-powered applications such as drones, fans, e-cigarettes, and cordless power tools including drills, handheld vacuum cleaners and blenders.

The new gate drivers integrate a bootstrap diode to reduce component count. A small form-factor 3 x 3mm DFN3030 package benefits space- and weight-constrained applications.

Logic level inputs (from 2.5V) allow the driver chips to be directly controlled from 3.3V MCUs, while the output steps up to the VCC supply (8V to 14V) to ensure the MOSFET is fully enhanced to reduce conduction losses.

The devices can drive the firm’s own 100A DMT4002LPS Mosfet. The drivers are said to have 1.8A source and 2.5A sink current capability, with which they can minimize switching time of very low RDS(ON) MOSFETS, including the DMT4002LPS, increasing overall system efficiencies.

Requiring only a single input, the DGD0506 half-bridge minimizes MCU GPIO pin count along with the design flexibility to program deadtime from 70ns to 420ns. For shorter deadtimes, the DGD0507 has separate high- and low-side inputs enabling higher switching frequencies with a 35ns max propagation delay that is matched within 5ns. This, along with cross-conduction prevention logic, protects the MOSFETs by ensuring that the high and low outputs are not both on at the same time.

Undervoltage lockout (UVLO) circuitry also protects the MOSFETs against a loss of supply.

In the DFN3030 package, the DGD0506 and DGD0507 offer a pin-for-pin alternative to popular industry types.

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Get further information in the full Press release.

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